Mechanism for converting motion.



LPROKSA. ECHANISM FOR CONVERTING MOTION.

Patented Jan. 4, 1916.

30. 1 detail sectional elevation of thei cam'drum' and its star Wheel, with the parts in a dif-' v.

' time:

" f megawat s;-eoiweamemm To'aZZ whom it may concern? I 5 Be it known that 1, JOHN PROKSA, a c1t1- zen of the United StatesofAmerica," and resident of (lhicagoyin the county of Cook,

State ofllli n ois, have invented certain new and useful Improvements in Mechanism for? Converting M :tio of vvhi ch the follow ng;

is a specification. This 1nvent1on1 relates to rotary motion, and has for its object to providea simple and efiicient formation and are rangment ofparts in a mechanism for producing intermittent rotary niotion,.snch asinfthe step-by-step film feeding niechanism ofa moving picture apparatus, and with I wvhich a rapid active movement or feed of the film is attained in an even manner and" With the avoidanceof erking,and in Which the film and its feeding accessories are ef fectively': held in their position: of rest and lost motion-j between the partsprevented,all

V as will hereinafter'n ore fully appear.

In the accompanylng drawings Figure 1,-is a front elevation of a mechanismenr-b bodying the present invention,'= andillustrating the'same in connection With the film feeding sprocket 'drum' of a'moving' picture" a'pparatus.-- Figu2, is an end elevation of the sa1ne,'*with partsin section. Fig. 3, 1s a ferent position from-that shown'in Fig.2.

' Figsj l, 5"and 6, are detail vieWs il-lus'trafl tion shown in Fig; 1, the driven shaft carries at oneend afpinion 4:, preferably of s the star-Wheel type shown, and at' the other;

' endthe film-feeding sprocket drum 7 of aing modified forms of the present invention;

imilarfreference numerals-indicate like parts n the several YLBWS:

'Referrlngto the drawln'gs, 1

journaled the driving shaft 2,'an'd thegd'riven shaft 3 of the mechanism. 7 In the construe vmoving picture apparatus. .i

1 8 is a cam diskor drum secured to'and r o- :tating with thee-driving shaft 2, and'fo'r'med; V With '.ca1n grooves and other star Wheel en gagingmeans', noivltoi'be described. ii

9 are a pair of oppositely inclined m terpart grooves formed-in parallel relation, in'the periphery of the cam, disk 8, an'ddi's-f posed in separated relation so that theywill' Jo 'H a Y 1? a o Ks A, r {o "c H rose o.,f I L n1 itoa s.

I Specification of Ietters latent.

Application file rl May 2 '7, an, serial na's iiesag I means forgconvertin'g continuous rotary into lntermittent ing its periods of rest.

;ing the requiredpartialrotation to the star wheel 4 on each revolutionmfthe cam disk. "11- are lateral throats orpassages connect-,-

represents asupporting 'f-rameorihousing of'a'ny usual and' suitalole construction, an'd 'i n which are I its prongs 5'fw i-th th'epair of "grooves ,9, and

assaidspir ing,-the inclination the groovesf9 will correspond with the l radial f disposition of hile suchengagement prevails.

[In" the' preferred form of the present .receiveiitwo radially ai -ma"meander: cally for'r'ned prongs 5-0f the star Wheel 4, I above referred'to.*"A s shoWn'in the dra -'.1-

fiat portions 6 in its perimeter, intermediate? of theradial prongs 5, andsaid fiat portions 6 are. adapted to successively bear "upon the 1 10 is 'a-spiral grooveor passage-formed aforesaid pair of :camgroov'es 9 of the cam disk, and provldlng the "means for' imparting with, and in dividu'al 'to, the pair of camgroovesfi, aforesaid, andada'pted in" the one case", to permit the -star -ivvhe'el prongs to successively, pass "'into one of th'egrooves 9, and in the other c'a'seyto per-v mit sald star Wheel prongs to successively pass iout of the other' -of 'said grooves 9 in the conti'nued'operation of the mechanism. 7 lViththe describedconstruction the starheel 471s positively and 'efiect ively held from independent movement offrota'tion during; its normal pe'rlod jof rest by the de scr bed close 'fand extended engagementof heldffrom anymoveinent diiring I the s 'd 'ee scribed 'periodrojf rest ofthefs'tar-vvheel.

star-Wheel prong jin advance,1;begins tjo'leave star wheeldurn the pe'rlphery of the disk 8 and forml-nga transversecommunication between the I lathe present? ;twnstruction asflthe spiral a groove 10 begins' operativeengagement 'Wl-illi onorfof the starheel prongs 5,;th'e1neXt" v;

its engiageinentavith'groove 9, inf vv'hich; 1

6m eheee ht" "wi h" e rs mail? the aforesaid prongs 5, so that thefsame' W111 L snugly'fitthe grooves and prevent'any 'inde; p'enden'tmovement'- ;of 'the star; Wheel :4;

tioned star-wheel prong 5, the next star wheel prong to the rear, comes into engagement with the other groove 9, through its I lateral throat or passage 11. Said engagement between. the last mentioned prong and groove prevails until the cam disk 8, in its circular movement brings said prong into scribed, will open laterally through the outer walls of the respective grooves ,9, as illustrated in Fig. 2. When however, it is desired to insure greater certainty in the entrance of the star wheel prongs 5 into the initial one of said grooves 9, the outer wall of said groove will be provided with a curved deflector wing 12, as illustrated in Fig. 5, which wing is adapted to pass over an adjacent star-wheel prong to direct and move said prong into said groove 9.

The scope of, the present invention embraces a reverse formation of the cam grooves 9 and 10 of the cam disk, and the radial prongs 5 of the star-wheel, and so that a peripheral rib 9 will replace the grooves 9, 10; and a radial recess 5. replace each individual star wheelprong 5, as illustrated" inFig. 4. The scope of the invention also embraces the disposal or formation of the cam grooves 9, 10, or cam ribs 9 in the side face. of a cam disk, in manner indicated in Fig. 6.

Havingthus fully. described my said invention, what I claim as new and desire to secure by Letters Patent .is

V 1. In a mechanism for convertingmotion, the combination of a driven shaft, a pinion carried by said shaft and formed with flat portions on its perimeter, a cam disk formed with a pair of oppositely inclined holding faces disposed in separated relation and with a spiral-operating face intermediate of and connecting said holding faces and adapted for operative engagement with the aforesaid pinion, and a driving shaft carrying said cam disk, the said cam disk having flat circular faces adjacent to its inclined holding faces. for bearing engagement with the flat portions of the pinion aforesaid, substantiallv as set forth.

In a mechanism for converting motion, the combination of a driven shaft,a star wheel carried by said shaft, a cam disk formed with a pair of holding grooves disposed in separated relation and with a spiraloperating groove intermediate of and connecting said holding grooves and adapted for operative engagement with the prongs of the star-wheel aforesaid, the holding grooves having lateral passages, and a driving shaft carrying said cam disk, substantially as set forth.

3. In a mechanism for converting motion, the'ccinbination of a driven shaft, a star wheel carried bysaid shaft, a cam disk formed with a pair of periphera holding grooves disposed in separated relation and with a peripheral spiral operating groove intermediate of and connectingsaid holding grooves and adapted for operative engagement with the prongs ofthe star-wheel aforesaid, and a driving shaft carrying said cam disk, substantially as set forth.

4:. lnamechanism for convertingmotion, the combination of a driven shaft, a starwheel carried by said shaft, a cam disk formed with a pair of oppositely inclined holding grooves disposed in separated relation and with a spiral operating groove intermediate of and connecting saidholding grooves and adapted for operative engagement with the prongs of the starwheel aforesaid, and a driving shaft carrying said cam disk, substantially as set forth.

5. In a mechanism for converting motion, the combination of a driven shaft, a star wheel carried by said shaft a cam disk formed with a pair of oppositely inclined peripheral holding grooves disposed in separated relation and-with a peripheral spiral operating groove intermediate of and connecting said holding grooves and adapted for operative engagement with the prongs of the star-wheel aforesaid, and a driving shaft carrying said cam disk, substantially.

as set forth.

6. In a mechanism for converting motion, the combination of a driven shaft, a starwheel carried by said shaft and having flat portions in its perimeter intermediate of its prongs, a cam disk formed with a pair of oppositely inclined holding means separated by a cylindrical portion of the disk and with a spiral operating means intermediate of and connecting said, holding-.means and adapted for operative engagement with the aforesaidstar wheel, and a driving shaft carrying said cam disk, substantially as set forth. s

1 7. In a mechanism for converting motion, the combination of a driven shaft, a star wheelcarri'ed by. said shaft and having flat portions in its perimeter. intermediate of its prongs, a cam disk formed with a pair of holding grooves separated by a cylindrical portion of the disk'and with spiral operating groove intermediate of and connecting said holding grooves and adapted'for operative engagement with the prongs of the star wheel aforesaid, the holding grooves having lateral passages, and a driving shaft carrying said cam disk, substantially as set forth.

8. In a mechanism for converting motion, the combination of a driven shaft, a star Wheel carried by said shaft and having flat portions in its perimeter intermediate of its prongs, a cam disk formed With a pair of peripheral holding grooves separated by a cylindrical portion of the disk and With a peripheral spiral operating groove intermediate of and connecting said holding grooves and adapted for operative engagement With the prongs of the star-Wheel aforesaid, and a driving shaft carrying said cam disk, substantially as set forth.

9. In a mechanism for converting motion, the combination of a driven shaft, a star Wheel carried by said shaft and having fiat portions in its perimeter intermediate of its prongs, a cam disk formed With a pair of oppositely inclined holding grooves separated by a cylindrical portion of the disk and With a spiral operating groove intermediate of and connecting said holding grooves and adapted for operative engagement With the prongs of the star Wheel aforesaid, and a driving shaft carrying said cam disk, substantially as set forth.

10. In a mechanism for converting motion, the combination of a driven shaft, a star Wheel carried by said shaft and having fiat portions in its perimeter intermediate of its prongs, a cam disk formed with a pair of oppoistely inclined peripheral holding grooves separated by a cylindrical portion of the disk and with a peripheral spiral operating groove intermediate of and connecting said holding grooves and adapted for operative engagement With the prongs of the star-Wheel aforesaid, and a driving shaft carrying said cam disk, substantially as set forth;

Signed at Chicago, Illinois, this 23rd day of May, 1.914.

JOHN PROKSA.

Witnesses:

ROBERT BURNs, IVA L. CRANE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washingtom'IL'G. 

